dan-q / spies-guidebook-pocket-code-card Goto Github PK
View Code? Open in Web Editor NEWDigital version of the pocket encoder/decoder from the Usborne Spies' Guidebook
Home Page: https://danq.dev/spy-pocket-code
License: The Unlicense
Digital version of the pocket encoder/decoder from the Usborne Spies' Guidebook
Home Page: https://danq.dev/spy-pocket-code
License: The Unlicense
According to the book, valid keys are 1-2, 3-4, 5-6, 7-8, 4-1, 2-3, 6-7, 8-5, 2-5, 6-1, 4-7, and 3-8. The current warning heuristic is incorrect for some of these (e.g. 1-6 is valid, 3-6 is invalid).
A concise test for whether a key (i,j) is valid is
((i-1)>>1 ^ (j-1)>>1) < 3
Explanation:
(i-1)>>1
converts both the even and odd keys to [0,3]a ^ b < 3
tests that the edit distance between pairs is 0 or 1 (since the numbers are 2-bit)A declarative, efficient, and flexible JavaScript library for building user interfaces.
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